The Encore Systems PayPal Software Development Kit supersedes the Encore PayPal Class Libraries. More than a wrapper for the Website Payments Pro API, the SDK provides many new features. One of the most important features is that it is a unified SDK for both Website Payments Pro and the new Adaptive Payments API. The most exciting new feature is the drag-and-drop PayPal controls. With absolutely no API programming, the developer can drop a control on the design surface, set a few properties, and have that particular API transaction ready to go.